Photographic film



May 8, 1923- w. L. DODGE.

PHOTQGRAPHIC FILM Filedv Jan; 123 1920 Patented my a, 1923.

- UNITED STATES WILLIAM L. bones, or novnn, nnw nm'rsmn.

rnosroemnrc mm.

Apnlication filed January 28, 1920. Serlai No. 853,458. I

To all whom it may concern:

Be it known that I, WILLIAM L. Doves,

a citizen of the United States, and a resident of Dover, in the county of Strafl'ord, in the State of New Hampshire, have invented a-certain new and useful Improvement in Photographic Films, of which .the following is a specification, reference being had to the accompanying drawings.

This. invention relates to sensitized films for use in photography and it has for its.

object the provision of a strip film of novel construction in which special provision is made whereby any desired section or portion of said strip may be readily selected and detached from the strip without, in any manner, interfering with the remainder of said strip, without resort to a dark room, and without requiring the strip to be removed from the camera.

For the purpose of explaining my invention clearly I have provided the annexed drawing, in which the single figure shows a plan view of a portion of a strip film of my newly improved construction.

Referring to this drawing, the letter a indicates the strip of film as a whole, which may be except for the 'novel features in which the present invention is embodied substantially'like strip films commonly used in roll holding camerasof the general type now in common use. In preparing the strip so that any desired section of it may be selectively detached and removed from the camera for development, I cut the strip of film into a plurality of connected sections or fields of exposure, each section being of the size of the desired negative; the sides of the partly severed sections being indicated by the open slots 6 and c which extend longitudinally of the film, and the endsof each section being completely severed from the next adjoining section by transversely extending slits d. The side slots 6 and '0, however, do not extend quite to the transverse slits, thus leaving short, integral portions e and e by means of which each partly severed section remains joined to the film strip sufiiciently so that, when the strip is fed in either dlrection, the several partly severed negative sections will be carried along with the strip.

If desired, the entire strip of film may be used in the usual manner, that is to say, without completely severing one or more of the exposed sections and removing it or themv from the camera for immediate development but, in the event that certain selected,exposed sections are desired for immediate development, it is only necessary to sever the uncut portions e and e of the film and then remove the separated section from y the camera by any suitable means as, for example, the means illustrated in my end-- ing application Serial No, 358,804, file February 14, 1920, for camera.

The ends of the transverse cuts d are enlarged, or in other words, run into perforat10I1S 0f appreciable. diameter. Such rforations or enlargements are indicate at s and are in line with the longitudinal slots b and c and located between the contiguous ends of adjacent slots. The purpose of the perforatlons is to facilitate bringing the transverse cuts into re 'ster with the sever ng knives described in my aforesaid apphcation; that is, to enable these. knives to detach wholly the corners of a selected sectlon even though the film should be arrested with the cut d not exactly in line withthe points of the knives. The reason for glving the slots 6 and c appreciable width in the transverse dimensions is to insure registry with the severing knives even though the film should be displaced slightly to one side or the other of its intended path.

The desired film sections may thus be removed from the camera in a dark room or they may be transferred directly from the camera into an opaque receptacle in lighttight connection therewith in open daylight, asully described in my application aforesai Any selected section or panel of the film may be severed and removed while the balance of the film remains in the camera, whether the removed panel is the first, last or any intermediate one. During the course of ejecting a section and of subsequently feeding the film forward after the section has been ejected, the uncut edge portions of the film serve as traction bands to pull the film from one spool to the other.

Having thus described my invention, I claim l 1. A photographic film'strip having interior panels or fields of exposure partly severed from the edges of the strip by longitudinal cuts which are substantially coextensive with said fields of exposure.

2. A photographic film strip havin panels or fields of exposure partly severe from 20 verse cuts which terminate s ort of the opthe strip by longitudinal and transverse cut-s, which longitudinal cuts are nearly as long as such fields of exposure.

3. A photographic film strip having interior sections or fields of expos re partiallv severed at sides and ends from t e strip, but integrally united thereto at their corners in such manner that u n cutting the corner junctions of any section such section may be removed from the strip, leaving the edge portions of the strip intact.

4. A photographic film strip having transverse cuts, at the ends of which are perforations of appreciable diameter, wholly within the edges of'the strip whereby such edges extend unbroken past said cuts, and the strip having also longitudinal slots between and in line with said perforations, but separated therefrom by integral parts of the strip.

5. A'photographic film stri having transposite edges of the strip, and longitudinal discontinuous slots of appreciable width near said edges, such slots terminating short of the transverse cuts adjacent to their respective opposite ends. .a

6. A photographic film strip having transverse slits, each extending uninterruptedly across the strip but terminating short of the edges thereof.

7. A photographic film strip having transverse slits spaced apart from one another equally to the length of successive fields of exposure, said slits being each continuous from end to end but terminating within the side edges of-the strip.

8. A photographic film strip having trans verse slits, each continuous from end to end but terminating within the side edges of the strip in perforations of appreciable diameter. v

WILLIAM L. DODGE. 

